There are 16 US Post Offices in Kauai County serving a total of 81,599 residents equating to 5,100 residents per post office. It's estimated that approximately 130,241 packages are handled across the 16 county post offices annually. Kaua\u02bbi County is a county located in the U.S. state of Hawai\u02bbi. It consists of the islands of Kaua\u02bbi, Ni\u02bbihau, Lehua, and Ka\u02bbula. As of the 2010 Census the population was 67,091. The county seat is L\u012bhu\u02bbe. The Kapa'a Micropolitan Statistical Area includes all of Kauai County."